This is typical switching power regulator noice. What value are the chokes and the capacitors? Also it would be helpful if you would shoot a picture of the setup - so we can see how the chokes and caps are installed.

Could be the switching power supply if you're using one. It may not be filtered well enough for the camera or the video TX. Alternatively, it could be the camera shielding isn't good enough. See if the problem goes away if you adjust your grounding for the TX and the camera. Lastly, it could be coming on your receiver side as well so you may want to check that.